I can name you Horvat, Schenn, Eric Staal and say that Gallagher and Tatar would look better with them, you will dismiss it and the conversation won't go farther, that's why I used elite centres for my example.
You said that: "It's a coincidence Kovalchuk produced, it's a coincidence Tatar had back to back career years, it's a coincidence that Gallagher set a career high in goals. There seem to be quite a lot of coincidences when it comes to Danault." You clearly meant it.
I claimed that, because Danault is a grinder and I don't want that in my top-6 as a centre. He's not a goal scorer, he can't make good passes on a regular basis, He has stone hands, he can't create space and time for his wingers with his dribbles... Many times we see him lose the puck during the PP as he forces passes while he does not have the ability to execute them. He's strong against the board, he can keep the puck in these situations, can make simple passes, he's pretty good defensively, has a good hockey sense and skate well, protect the puck tremendously.
He's on pace for 55 points, playing with the best wingers in EV and in the PP. The last 39 games he's getting 1:53 on average per/game, but he's still bad on the power play, only got 3 points during that time. His skill set is not suited for the Power play.
Domi, now that he's looking like the player we watched last year and Suzuki would do better than him with Tatar and Gally. They are already close in points. Domi is not as good defensively as Danault, but Suzuki is pretty close.
Gallagher was on pace for 28 goals in his rookie year with a young Eller, many years after and during his prime, he only scored 33 goals in his best year and you are here bragging that he did it with Danault. I'm sure that with a centre who can ditch the puck, he will score more goals. He's already pretty good at scoring garbage goals by his own.
Tatar is scoring at the same rate as he used to with the wings, the thing is he's getting more assists than he used to and Danault with his 13 goals is not doing much to help him in that area.